Malicious PDF — malware analysis report

Static analysis result for SHA-256 f38684d17298396a…

MALICIOUS

PDF

44.9 KB Created: 2020-05-26 04:08:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d382a2a06e643b7d28b53bcc672328ce SHA-1: 62577972067807072445348c8eefeac284b5dc0a SHA-256: f38684d17298396a6f877a2fd99973b54b85afab8477e5ff313c3d11da54c749
94 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of external links to other PDF files hosted across numerous domains, as indicated by the PDF_SEO_LINK_FARM heuristic. The ML classifier also strongly flagged this PDF as malicious. The document body, though partially corrupted, contains text related to 'Christmas tree coloring page pdf' and metadata from wkhtmltopdf, suggesting a lure for potentially unwanted content or a distribution point for further malicious activity. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://activeairga.com/uploads/1/3/0/5/130588834/130588834.html#christmas+tree+coloring+page+pdf
    • http://swingstatestories.com/uploads/1/3/1/8/131871977/bazopadifoxavede.pdf
    • http://delcolacrosse.com/uploads/1/3/1/0/131070098/fimezubiminam-bufaze.pdf
    • http://fanshuixinyuyulecheng.br3h.com/uploads/1/3/0/7/130740110/soguxudegiziji_lisebix_nisuzin.pdf
    • http://escuelasporlavida.com/uploads/1/3/1/4/131410479/foderomerunasi-goxinudarezi-vuduzerifa.pdf
    • http://autodiscover.atriumcorporatepark.com/uploads/1/3/0/7/130739640/wejolu_jikezuzus_mitofazifexu.pdf
    • http://carpenter-lomax.com/uploads/1/3/0/2/130289292/ed2b99de7bf1095.pdf
    • http://perfectplumbingandgasfitting.com/uploads/1/3/0/5/130551684/3212929.pdf
    • http://webmail.sass-and-crafts.com/uploads/1/3/1/3/131398411/fabadur.pdf
    • http://skintagsremoved.com/uploads/1/3/0/2/130272247/digalotizikize.pdf
    • http://imextrailersireland.com/uploads/1/3/1/4/131482828/wibefitaxufogarame.pdf
    • http://cleanandgreenhvac.com/uploads/1/3/0/2/130288887/koretijufutisi.pdf
    • http://tonydouglas.com/uploads/1/3/0/7/130775247/0a8279.pdf
    • http://thelunchbox.biz/uploads/1/3/0/4/130478819/rasiburevol.pdf
    • http://chestercanoehire.com/uploads/1/3/0/5/130589050/3011303.pdf
    • http://savonfraiche.com/uploads/1/3/0/8/130814083/e0af8aeb13bbf5.pdf
    • http://peliqo.com/uploads/1/3/0/9/130969151/mubexob.pdf
    • http://mrssnydersclass.com/uploads/1/3/0/8/130874218/9900228.pdf
    • http://leatherwoodwildlifeart.com/uploads/1/3/1/6/131606208/9c36cfab8aaa.pdf
    • http://mbrowncommunication.com/uploads/1/3/0/3/130323211/5663021.pdf
    • http://fairwayservicesinc.com/uploads/1/3/0/3/130313670/a672991141e1.pdf
    • http://fuelyouthministry.com/uploads/1/3/1/1/131164430/misumarum.pdf
    • http://externalclass.org/uploads/1/3/0/6/130605344/bosixovobik_kifetixenat_xodipedovuzaner.pdf
    • http://dinneratmeeshs.com/uploads/1/3/0/5/130590076/foruvakepefu.pdf
    • http://calfirstmortgage.net/uploads/1/3/1/4/131406864/kotivokarot.pdf
    • http://rbarti.com/uploads/1/3/0/6/130639616/31ef251ab2443bd.pdf
    • http://calfirstmortgage.net/uploads/1/3/1/4/131406864/kotivokarot
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000844c.bin
ec95f8b1a79b83f981ab93169a2de12341c47a1b9c8a5756f7510870053dc1ba		 pdf-font-stream PDF embedded font (sfnt) at offset 0x844C 10172 bytes

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